Electromagnet



E. E. YAXLEY May 21, 1929.

ELECTROMAGNET Filed May 6, 1927 Patented May 21, 1929.

UNITED STATES PATENT OFFICE.

RENEE! E. 'YAXLEY, OF CHICAGO, ILLINOIS; LEONA. G. YAXLEY ADMINISTRATRIX 0E SAID ERNEST E. YAXLEY, DECEASED.

ELEGTBDMAGNE'I.

Application filed Kay 6, 1921. Serial No. 189,835.

My inventionrelates to electro-magnets having armatures in swinging connectlon with supports that are formed of magnetlzable material and are included in the same magnetic circuits with the armatures and magnet cores. The invention has for its object an improvement in the joint between the armature and its magnetizable support. One of these two elements, preferably the armature, has a pin formation made integrally therewith and the other one of these two elements has an opening or recess receiving this pin formation whereby the swinging connection of the armature with its support is established. By thus making the pin formation integral with the part that carries it, there is no gap between the pin and the part carrying it to increase the reluctance of the magnetic circuit at this point. To further avoid increasing the reluctance of the magnetic circuit at the in, the support is formed with an arcuate sur ace upon which the armature bears and turns.

The invention will be more fully explained in connection with-the accompanying drawing in which Fig. 1 is a side elevation of an electro-magnet made in accordance with the preferred embodiment of the invention; Figs 2 is a side view of the structure shown in Fig. 1; Fig. 3 13a plan view; Fig. 4 is a perspective view showing cooperating parts in separated relation; and Fig. 5 isa sectional view on line 55 of Fig. 3 on a largerscale.

The magnet illustrated includes an energizing winding 1 wound abouta cylindrical magnetizable core 2 and confined in a winding space defined by the head pieces tion. An L shaped bracket 5 is assembled with the core 2 by a nut 6 which is screwed upon the reduced lower end of said core that is passed through the bracket, said nut clamp ing' thebracket against the unreduced part of the core. The bracket is continued alongside of the magnet winding and terminates in the region of the armature 7 which is mounted to swing at the other end of the core. The bracket 5 as well as the armature 7 and core 2 aremade of magnetizable material and are included in the same magnetic circuit that contains an air gap between the armature and core. This gap is nearly closed when the 3, 4, of insula-- armature is fully attracted upon energization of the magnet. The extent to which the armature may be swung away from the core 2 is limited by hook 8 carried by the armature and terminating just below the head piece 3. The armature 7 is shown as carrying a leaf spring 9 adapted to engage a contact 10, at the front end of the armature, when the armature is retracted by the spring 11 which places the armature in an idle or retracted position when the magnet is deenergized. Said sprin is' anchored, at one end, to a post 12 carrie by the bracket 5 and is attached, at its other end, to the stem of a T piece 13, the stem of this piece passing through an opening formedthrough the rear end of the armature, engaging the armature.

The armature bears and turns upon the convex arcuate surface 14 of an armature supporting angular bracket plate 15. This plate is of magnetizable material and is clamped upon and directly against the upper end of bracket 5 by the iron screws 16.

Pins 17 areformed by punchingthe armaturc from the outermost broad face of the armature to project from the broad face that is adjacent the core 2, these pins thus beingof the same magnetizable material as the armature and integrally formed therewith, whereby there are no reluctance effecting gaps or joints between the armature and these pins. The pins are freely received in openings or recesses 18 formed through the arcuate portion of the'angular bracket" plate 15. The spring 11 holds the armature upon its curved seat 14, but to further insure the retention of the pins in the recesses 18 a guarding plate 19, preferably of brass, is clamped between the plate 15 and the heads of screws 16, this guarding plate having an angular extension 20 which overlies the armature and is sufficiently close thereto to prevent the pins from rising clear of the armature bearing 18.

Having thus described my: invention, I claim:

I An electro-magnet including an energizing winding; an armature; a support for the armature formed'ofmagnetizable material and included in the magnetic circuit of the magnet, said' armature having a pin formation,

said support havinga convex arcuate surface armature in the region of the support and which is engaged by the armature in the re- .sufliciently close to the armature to maingion of the pin formation, there being a recess tain the armature upon the support. 10 in said support that receives said pin forma- In witness whereof, 'I hereunto subscribe 5 tion, to permit the armature to rock upon my name.

said arcua'te surface; and a guard carried'byv the support and in lapping relation to the ERNEST E. YAXLEY. 

